case $(uname -s) in
Linux)
  install_package "truffleruby+graalvm-20.1.0" "https://github.com/graalvm/graalvm-ce-builds/releases/download/vm-20.1.0/graalvm-ce-java8-linux-amd64-20.1.0.tar.gz#4fac212b37cd548831fd6587dd4d59dc068068815aa20323b47fde9529d6bb6e" truffleruby_graalvm
  ;;
Darwin)
  install_package "truffleruby+graalvm-20.1.0" "https://github.com/graalvm/graalvm-ce-builds/releases/download/vm-20.1.0/graalvm-ce-java8-darwin-amd64-20.1.0.tar.gz#3b9fd8ce84c9162a188fde88907c66990db22af0ff6ae2c04430113253a9a634" truffleruby_graalvm
  ;;
*)
  colorize 1 "Unsupported operating system: $(uname -s)"
  return 1
  ;;
esac